The Spanish word 'pargo', which refers to the red porgy (a type of sea bream fish), traces its origins back to ancient Greek. It comes from the Greek word 'phagros' (φάγρος), which also meant 'sea bream fish'. This Greek word was borrowed into Latin as 'phager', maintaining the same meaning, and eventually evolved into the Spanish 'pargo' we know today. The word has remarkably maintained its association with the same type of fish throughout its journey across languages and time.

There aren't many common Spanish words that are etymologically related to 'pargo', as this is a specific term for this particular type of fish that developed directly from its Greek and Latin ancestors.

While English doesn't have any common words directly related to 'pargo', it's worth noting that the scientific name for the red porgy fish, 'Pagrus pagrus', comes from the same Greek root. The English word 'porgy', which refers to the same type of fish, is likely related as well, though it reached English through a different path.